SLC6A3 and Parkinson disease: A 72-year-old man was clinically suspected to suffer from PD in 2011. PD and RBD diagnoses were confirmed by DaTSCAN and PSG. 6-months after melatonin treatment, clinical signs of RBD were absent. Control PSG in 2014 confirmed normalized REM sleep with atonia. DaTSCANs performed in 2013 and 2015 indicated normalization of DA transporter density